Time-recording device



March 24, 1931. G, H DERR|K 1,797,332

TIME RECORDING DEVICE Filed March 2, 1927 4 Sheets-Sheet l LEI;

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TIME RECORDING DEVICE Filed March 2, 1927 4 Sheets-Sheet 2 INVENTOR. [0, fljme/ck.

March 24, 1931. 5; DERRlCK 1,797,332

TIME RECORDING DEVICE Filed March 2, 1927 4 Sheets-Sheet 3 INVENTOR.

ORNEYS.

March 24, 1931.

G. H. DERRICK ,797,332

TIME RECORDING DEVICE Filed March 2, 1927 4 Sheets-Sheet 4 I M 27 26 f /7- Z6 6 /fi 'T-E; /25 7 INVENTOR. 6,50, flflAWR/QQ.

Patented Mar. 24, 1931 UNITED I STATES PATENT OFFICE GEORGE E. DERRICK, OF OAKLAND, CALIFORNIA; VICTORY A. DERRICK, EKECUTRIX OF SAID GEORGE H. DERRICK, DECEASED, ASSIGNOR, BY MESNE ASSIGNMENTS, 1'0 INS'IOGRAPH, LTD., A CORPORATION OF CALIFORNIA TIME-RECORDING DEVICE Application filed March 2, 1927. Serial No. 171,995.

My invention relates to improvements in time recording devices, and it consists in the combinations, constructions, and arrangements, hereinafter described and claimed. An obJect of my invention is to provide a time recording device in which an electric switch is closed by a clock mechanism and is opened by the means which turn the printing wheels. The movement of the printing wheels is caused by a magnet energized by the closing of the switch.

A further object of my invention is to provide a device of the type described which has novel means for preventing the switch from closing more than once during each successive, equal interval.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawing, forming a part of this application, in which- Figure 1 is a top plan View of the device,

Figure 2 is a side elevation of the device, a portion thereof being broken away,

Figure 3 is a section along the line 33 of Figure 1,

Figures 4, 5, and 6 are views of the switch shown in different positions,

Figure 7 is a section along the line 7-7 of Figure 1, and

Figure 8 is a wiring diagram.

I will first describe the novel switch mechanism shown in Figures 4, 5, and 6. A clock 1 see Figure 2) rotates a shaft 2 by means of gearing 3. The shaft 2 carries an escapement wheel 4 and a ratchet 5. The wheel 4 is for permitting the closing of a switch, now to be described, while the wheel 5 receives a pawl 6 for permitting rotation of the shaft 2 in only one direction.

The switch includes a flexible arm 7 (Figs. 4, 5, and 6) which makes contact with a terminal 8 (Figs. 4, 5, and 6) when free to move of its own accord. The arm or switch blade 7 is raised into the positions shown in Figures 3, 5, and 6 by means of a laterally entending projection 9 (see Flgure 2) which is carried by an arm 10, the latter being pivotallysecured to the frame at 11. ,A pawl 12 s p votally secured to the arm 10 at 13 and 1s yleldingly held in engagement with the cscapement wheel 4 by means of a leaf spring 14 carried by the arm 10. The escapement wheel 4 turns in clockwise direction looking at Figure 4, and slowly lowers the switch blade 7 until the latter contacts with the terminal 8, as shown in the figure just mentioned.

As soon as the switch closes, a current will flow thru the relay 15 and a resistance coil 16 (see Figure 8), the special type of relay being illustrated in my co-pending application, Serial No. 171,996, filed March 2, 1927. The potential of the incoming current is 110 volts, and this is out down to about 6 volts after passing thru the resistance 16. This construction prevents the arcing and the fus ing of the contact point of the switch. The relay 15 closes a circuit thru a magnet 17 (see Figures 5 and 8), which causes an armature 18 to move a switch-actuating member 19 against a lug 20 carried by the arm 10, thus swinging the arm from the position shown in Figure 4 into the position shown in Figure 5. The upward movement of the armature 18 also advances a pawl 21 one tooth on a ratchet 22, this ratchet having teeth thereon for a purpose hereinafter described.

A locking pawl 23 prevents the return movement of the ratchet 22. Figures 1 and 3 show the locking pawl 23, while Figure 8 shows a spring 24 for returning the armature 18 to initial position.

It will be noted that as soon as the magnet 17 (Fig. 8) is energized, it will move the arm 10 (Figs. 3, 4, 5, and 6) to open the switch? and thus de-energize the magnet. The upward swing of the arm 10 is so quick and powerful, due to the strength of the magnet 17 that it might cause the pawl 12 to swing free of the escapement wheel 4. If this should happen, the arm 10 would again drop into the position shown in Figure 4, thus once more closing the circuit thru the magnet 17 and causing the arm 10 to again lift. This making and breaking of the circuit could happen a number of times, and

each time the ratchet 22 would be advanced one tooth.

To overcome this, I provide means for temporarily holding the arm 10 in upright position, thus giving the leaf spring 14 ample time to cause the pawl 12 to en age with the next succeeding tooth on the w eel 4 and to permit the armature 18 to return to its initial position. The arm 10 carries a tooth 25 (see Figure 4) which is caught by a springpressed keeper 26 pivoted to the frame at 27. The keeper 26 hol s the arm 10 in its uppermost position while the switch moving member 19 moves between the pro'ection 20 (see Figure 5) and the keeper 26 see F igure 6). This interval of time permits the lea spring 14 to bring the pawl 12 into engagement with the next succeeding tooth on the wheel 4. Just when the armature 18 reaches its lowermost position, the switch actuating member 19 will engage with the keeper 26 and move it against the tension of the spring into the position shown in Figure 4, thus freeing the arm 10. The pawl 12 will now hold the arm 10 in raised position and the rotation of the wheel 4 will gradually permit the pawl and the arm to lower so that the switch 7 again makes contact with the terminal 8. The operation is then repeated.

Each time the ratchet 22 is advanced one tooth, it will advance a printing wheel 29 one-sixtieth of a revolution. I have constructed the present device for keeping the minutes and hours, although it is apparent that the device may be changed for keeping any other interval of time without departing from the spirit and the scope of the invention. The wheel 29 has numbers from 1 to 60, corresponding to the number of minutes in an hour. The wheel 29, together with the hour wheel 30 and meridian wheel 31, are carried in a cage 32 which is removably secured to the frame 33 by means of screws 34 (see Figure 1). A bolt 35 (see Figure 2) also aids in securing the cage 32 to the frame 33. Figures 1, 2, and 3 clearly show how the shaft, which carries the ratchet 22, has a female clutch member 36 engageable with a male clutch member 37 which is integral with the wheel 29. The wheel 29 is rotatable independently of the wheels 30 and 31, but is connected therewith by the means shown in Figure 7 A cam 38 is rotated by the wheel 29 and slowly rocks a bell crank lever 39 to the right, on looking at Figure 7, until the wheel 29 makes one complete revolution, whereupon a spring 40 will quickly pull the lever 39 to the left. The movement of the lever 39 to the right causes a pawl 41, carried by the lever, to advance over a ratchet 42 integral with thewheels 30 and 31. A quick movement of the lever 39 to the left carries with it the pawl 41 and causes the pawl to rotate the wheels 30 and 31 one additional space for indicating the next hour.

In Figure 2, I have shown a platen 43 for pressing a strip of paper or the llke against the printing wheels 29, 30, and 31. In case it is desired to set the device, a key (not shown) is secured to a shaft 44 (see Figure 1) and the shaft, moved against the tension of a spring 45 for causing a gear 46 to mesh with the ratchet 22.

I claim:

1. In a reciprocating electric motor, a driving shaft, a toothed wheel aflixed to the driving shaft, a pivoted arm, a pawl pivotally related to the free end of the arm and engaging the teeth of the toothed wheel, a contact member supported by the pivotal arm, a driven shaft having a toothed wheel afiixed thereto, an electro-magnet, an armature pivotally related to the magnet, actuating means carried by the armature for rocking the free end of the arm upwardly and a pawl carried by the actuating member and engaging the teeth of the wheel aflixed to the driven shaft.

2. In a reciprocating electric motor, a

driving shaft, a toothed wheel affixed to the H arm, a driven shaft having a toothed wheel aflixed thereto, an electro-magnet, an armature pivotally related to the magnet, actuating means carried by the armature for rock ing the free end of the arm upwardly, means for securing the free end of the arm in raised position and a pawl carried by the actuating member and engaging the teeth of the wheel aflixed to the driven shaft.

3. In a reciprocating electric motor, a driving shaft, a toothed wheel aflixed to the driving shaft, a pivoted arm, a pawl pivotal ly related to the free end of the arm and engaging the teeth of the toothed wheel, a contact member supported by the pivotal arm, a driven shaft having a toothed wheel affixed thereto, an electro-magnet, an armature pivotally related to the magnet, actuating means carried by the armature for rocking the free end of the arm upwardly, means for securing the free end of the arm in raised position, a pawl carried by the actuating member and means for urging the pawl into engagement with the teeth of the wheel aflixed to the driven shaft.

4. In a reciprocating electric motor, a driving shaft, a toothed wheel aflixed to the drivin shaft, a pivoted arm, a pawl pivotally re ated to the free end of the arm and engaglng the teeth of the toothed wheel, resilient means for urging the pawl into engagement with the teeth of the wheel, a contact member supported by the pivotal arm, a driven shaft having a toothed wheel afiixed thereto, an electro-magnet, an armature pivotally related to the magnet, actuating means carried by the armature for rocking the free end of the arm upwardly, and a pawl carried by the actuating member and engaging the teeth of the wheel affixed to the driven shaft.

5. In a reciprocating electric motor, a driving shaft, a toothed wheel aflixed to the driving shaft, a pivoted arm, a pawl pivotally related to the free end of the arm and engaging the teeth of the toothed wheel, a contact member supported by the pivotal arm, a driven shaft having a toothed wheel affixed thereto, an electro-magnet, an armature pivotally related to the magnet, actuating means carried by the armature for rocking the free end of the arm upwardly, a recessed leaf spring for engaging the arm when in one position and a pawl carried by the actuating member and engaging the teeth of the wheel affixed to the driven shaft.

6. An electric motor comprising a driving shaft, a driven shaft, a toothed wheel affiXed to the driving shaft and a toothed wheel aflixed to the driven shaft, a pawl for engaging the teeth of the toothed wheel of the driving shaft, a contact member operably related to the pawl, an electro-magnet, an armature for the magnet, an actuating mem ber carried by the armature for actuating the contact member and a pawl engaging the teeth of the wheel of the driven shaft.

I11 testimony whereof I afiix my signature.

GEORGE H. DERRICK. 

